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Databases Reporting with SQL Aggregate and Numeric Functions Summing Values

Ker Sing Tan
Ker Sing Tan
10,573 Points

solve missing where cause error

I got this error : You are missing the WHERE cause.

But I have put HAVING into this syntax:

SELECT SUM(rating) AS starman_total_ratings FROM reviews GROUP BY movie_id HAVING movie_id = 6;

Challenge: We're in a movie database. There's a reviews table with the columns of id, movie_id, username, review and rating.

The movie "Starman" has the id of 6. Movie ids are found in the movie_id column in the reviews table. Write a query that totals up all ratings for the movie "Starman" in the reviews table. Alias it as starman_total_ratings.

1 Answer

Steven Parker
Steven Parker
229,645 Points

While your solution would also produce the correct result, you don't need HAVING or GROUP BY for this challenge. You can replace them both with a WHERE clause, which is what the challenge is expecting to see.

It seems to need ORDER BY otherwise it will add all the ratings for all the movies into one figure, I have SELECT SUM(rating) AS starman_total_ratings FROM reviews GROUP BY movie_id WHERE movie_id = 6; which makes sense in my head but i get the "There's something wrong with your SQL statement. Please review your code and try again." error